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LPC540: SWD and JTAG

Question asked by Jana Beck on Mar 16, 2020
Latest reply on Mar 19, 2020 by ZhangJennie

Hi!
I am currently on a project where we want to program via SWD, but also have the possibility to use JTAG for boundary scan if needed later on.

Some pins are used twice (eg. SWD: SWDIO, JTAG: TMS) and connect to different pins of the MCU (LPC540J16JBD100E).

 

- is this a problem, when I am using SWD, but also have a signal on JTAG pins (eg. PIO0_4 (TMS))

- do I need external resistors? For SWD I do not, but there is no information regarding JTAG in the datasheet.

 

Thanks!

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